No Spark
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Junior User
Joined: May 2001
Posts: 97
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From: Modesto USA!
No Spark
Hello all, I'm stumped!
My '69 has a new 390 with about 200 miles on it. Everything under the hood is new or rebuilt. It began to have a bad miss all of a sudden. I began to check everything out, timing, dwell, carb, you name it, and all looked good. Finally I noticed I had 12v going to the coil. When I had rewired the engine top it looked like there was no resistor wire and assumed it had been replaced with a ballast resistor under the dash - WRONG! The coil resistance was a little high and since I couldn't come up with anything else I replaced it with a internally resisted one. It started right up and ran fine... for about 10 miles. Now it won't hit a lick and there's NO spark from the coil. I've done every test in the Peterson book and the only thing that doesn't check is that there's NO resistance across the coil primaries so I still have 12v coming out of the coil(the book says it should be 2-3 ohms reisitance on an internally resisted coil with 9v coming out).
The one other thing that is weird was after I replaced the coil and the truck was running good, the meter showed NO dwell at all! But, the sprinkler had gotten the darn thing wet the night before and I can't even FIND the coil on that worthless Grand Am to see if the meter works!
Anyway this is the second new coil on this truck and in 25 years of owning '67 - '69's I've never replaced one before.
P.S. I know some will tell me to get an electronic ignition but I would rather stick with points, just stubburn I guess.
Thanks in advance.
Mike
My '69 has a new 390 with about 200 miles on it. Everything under the hood is new or rebuilt. It began to have a bad miss all of a sudden. I began to check everything out, timing, dwell, carb, you name it, and all looked good. Finally I noticed I had 12v going to the coil. When I had rewired the engine top it looked like there was no resistor wire and assumed it had been replaced with a ballast resistor under the dash - WRONG! The coil resistance was a little high and since I couldn't come up with anything else I replaced it with a internally resisted one. It started right up and ran fine... for about 10 miles. Now it won't hit a lick and there's NO spark from the coil. I've done every test in the Peterson book and the only thing that doesn't check is that there's NO resistance across the coil primaries so I still have 12v coming out of the coil(the book says it should be 2-3 ohms reisitance on an internally resisted coil with 9v coming out).
The one other thing that is weird was after I replaced the coil and the truck was running good, the meter showed NO dwell at all! But, the sprinkler had gotten the darn thing wet the night before and I can't even FIND the coil on that worthless Grand Am to see if the meter works!
Anyway this is the second new coil on this truck and in 25 years of owning '67 - '69's I've never replaced one before.
P.S. I know some will tell me to get an electronic ignition but I would rather stick with points, just stubburn I guess.
Thanks in advance.
Mike
